First thing I can multiply in the answer I get from all the flying you're going to add that number and you'll get your answer
see diagram
we see we doulbe the 3 to add
3*2=6
6+12=18
6+15=21
thelength and width of the surfface is 18 by 21
P=2(L+W)
P=2(21+18)
P=2(39)
P=78
the perimiter is 78ft
Bryan will have to spend 19 days on vacation if he expects to take 1 picture per day. Since he already took 1 at home and he is taking 1 per day, 19 plus the one he already took would equal 20 pictures.
Hope this helps!